<?php
/**
 * Json         系统核心
 * @copyright   Copyright(c) 2024-2034
 * @author      tianjie <527707665@qq.com>
 * @link        http://www.tinphp.com/
 * @version     4.1
 */

namespace tian\response;

use tian\Request;
use tian\Response;

class Jsonp extends Response
{
    // 输出参数
    protected $options = [
        'var_jsonp_handler' => 'callback',
        'default_jsonp_handler' => 'jsonpReturn',
        'json_encode_param' => JSON_UNESCAPED_UNICODE,
    ];

    protected $contentType = 'application/javascript';

    /**
     * 处理数据
     * @param $data
     * @return string
     * @throws \Throwable
     */
    protected function output($data)
    {
        try {
            // 返回JSON数据格式到客户端 包含状态信息 [当url_common_param为false时是无法获取到$_GET的数据的，故使用Request来获取]
            $var_jsonp_handler = Request::instance()->param($this->options['var_jsonp_handler'], "");
            $handler = !empty($var_jsonp_handler) ? $var_jsonp_handler : $this->options['default_jsonp_handler'];

            $data = json_encode($data, $this->options['json_encode_param']);

            if ($data === false) {
                throw new \InvalidArgumentException(json_last_error_msg());
            }

            return $handler . '(' . $data . ');';
        } catch (\Exception $e) {
            if ($e->getPrevious()) {
                throw $e->getPrevious();
            }
            throw $e;
        }
    }

}
